Made of two or more elements chemically combined.
The building block of all matter.
A mixture of elements.
A pure substance.
All matter is composed of one element or a combination of two of more elements.
All elements are made of molecules.
All matter is made of hydrogen.
All matter is composed of two or more elements in a specific ratio.
Atoms have no overall electrical charge because each atom has the same number of electrons as protons.
All atoms of the same element are exactly alike and have the same mass. Atoms of different elements are different and have different masses.
An atom of one element cannot be changed into an atom of a different element. Atoms cannot be created or destroyed in any chemical change, only rearranged.
Every compound is composed of atoms of different elements combined in a specific ratio.
All elements are composed of atoms that cannot be divided.
Smooth and solid, like a lacrosse ball, that cannot be broken down into smaller pieces.
Like a muffin with positive charges and electrons scattered in spheres around the positive charges.
Like planets orbiting the sun, or the layers of an onion, electrons orbit the nucleus.
Like a cloud, with expanding energy levels.
Is a well-tested idea that EXPLAINS and connects a wide range of observations. It explains how nature works.
Is a statement that describes nature's behavior.
Is a method of inquiry used to test an idea.
Electrons move around a small positively charged nucleus in the center of the atom.
The electrons are in orbit like planets around the sun.
Electrons are in a cloud that floats around the nucleus.
Electrons have only specific amounts of energy related to the orbits in which they move.